I was recently reading about the 2011 Grimsvotn eruption. Apparently it marked a bigger development that I realised.The area was analysis of thorium content.The general picture is that apparently, ever since Laki, thorium content of magmas erupted in that area has been steadily increasing, up to and including the 2004 eruption...That all changed in 2011; the products of that eruption contained much less thorium than any eruption since Laki (if I'm remembering what I read correctly). This implies a new source of fresh magma, straight from the mantle...

Quoting: Anonymous Coward 23729870

a little bit funny that author posted it at the same time (absolutely same text, word in word) at the same different boards